NOTIFIER ABA-2 Audio Buffer Amplifier Instruction Manual
- June 9, 2024
- NOTIFIER
Table of Contents
ABA-2
Product Installation Drawing
For the Audio Buffer Amplifier
Audio Buffer Amplifier Installation Instructions
The Audio Buffer Amplifier (ABA-2) serves two functions. It increases the
total number of AA-30/AA-120 audio amplifiers that can be used in a System
5000 or AM2020/AFP1010 fire detection system beyond fifty, and it supplies one
of two user selectable backup tones that are automatically activated in the
event of the loss of the primary audio signal from the AMG– 1 or ATG-2. The
ABA-2 mounts in the bottom of a CHS-4 chassis, and can be used for single- or
dual-channel systems. One ABA-2 should be installed in each remote location
where AA-30s are installed; this will insure that all amplifiers have a
locally generated backup tone in the event of total AMG-1 failure or a break
in the audio wires leading to the amplifier cabinet. Local backup tone is
already available from the AA-120. The ABA-2 requires 65mA at 24V for
operation.
Each ABA-2 consists of one circuit board assembly, four #6-32 mounting screws,
four #6 aluminum hex standoffs, one Main Power Harness (75099), one Trouble
Cable (75098), two Audio Input Cables (75110), and two 470-ohm, 1/2 watt
end–of– line resistors (R-470). (In Canada, order N-ELR separately.)
Installing the ABA-2
The ABA-2 is designed to mount on a CHS-4 underneath an XPP-1 in an XP
Transponder System or the CPU-5000 in a System 5000. To install, place the
four supplied standoffs on the four male studs on the left side of the bottom
of the chassis. Place the ABA-2 over standoffs on the chassis and secure with
the four mounting screws supplied.
Note: For ease of installation we recommend connecting the Audio
cables(s) before mounting the ABA-2.
Wiring the ABA-2
Connect one end of the supplied Main Power Harness to P1 on the ABA-2 and
connect the other end to an available power connector on the XPP-1 (P8 or P9)
or the CPU-5000only one connector is available — chaining is acomplished
through the ABA–2. Connect the supplied trouble cable to P7 on the ABA-2 and
connect the other end to either P9 or P10 on one of the AA-30/AA-120s. Note:
In XP Transponder systems, the trouble cable connects P7 on the ABA-2 to P6 on
the XPP-1. If P6 is already occupied, connect the cable to P9 or P10 on one of
the AA-30/AA-120 amplifiers. (These are all normally open trouble contacts
that are simply chained together in any order to report trouble back to the
XPP– 1.)
Connect the low-
level Channel One audio to the ABA-2 on P3 pins 1 and 2. Connect the shield to
pin 3. Pins 4, 5 and 6 continue the audio through to either the next remote
cabinet or return to the AMG-1 in a four-wire supervised configuration. If the
ABA–2 is the last device on the low-level audio line and the 4-wire return is
not used, terminate the channel with a 470ohm End-of-Line Resistor (supplied
with the AMG–1) across P3 Terminals 4 and 5. For dual-channel operation, wire
P5 on the ABA–2 to the second audio channel the same way that P3 is wired to
the primary channel. If the ABA-2 and the AA-30/AA-120s reside in different
cabinets . . .
Connect ABA–2 P3 pins 7, 8 and 9 to the audio input of one of the AA-30/AA-
120s (P3 Terminals 4, 5 and 6) in a single-channel audio system, or to the
channel select switches on a dual-channel system. On dual channel systems,
connect P5 pins 7,8 and 9 to the Channel Two amplifier in the same fashion as
Channel One.
If the ABA-2 and the AA-30/AA-120s reside in the same cabinet . . .
For single-channel operation, connect one end of the Audio Out Cable to P4 on
the ABA–2 and the other end to P2 on an AA-30/AA-120. For dual-channel
operation, connect one end of the second Audio Out Cable to P6 on the ABA–2
and the other end to P2 on an AA-30/AA-120.
IMPORTANT! The Audio Cable connectors must be oriented correctly to ensure
that the polarity is matched beween the ABA–2 and the AA-30/AA-120.
Final Connections
A 470-ohm End–of–Line Resistor (supplied with the ABA–2) must be placed at the
last AA-30/AA-120 on each channel of the ABA–2.
Adjusting the Amplifier Output
Note: The following procedure must be performed after all amplifiers have been
installed in the system. Set all DIP switches on the ABA–2 to the OFF
position. (In a dual-channel system, set DIP Switch four ON.) Apply power to
the alarm system. With the system in normal standby, adjust SW1 (ten position
rotary switch) on the ABA until LED1 “NORMAL LEVEL” is lit and LED2 “INCORRECT
LEVEL” is extinquished. This adjustment compensates the audio level for line
losses. In a dualchannel system, adjust SW2 for the same indication on LEDs 3
and 4. Complete the procedure by adjusting the gain on all AA-30/AA-120s for
“NORMAL LEVEL” indication.
Adjusting the Amplifier Output
After all ABA-2s have been adjusted, set the amplifier output on all AA-30/AA-
120s in the system.
Testing
After installation, disconnect the low-level audio signal to the ABA–2. Within
40 seconds, the trouble LED on the ABA–2 should light and the fire alarm
control panel should signal a trouble. The selected backup tone should be
heard through any activated speaker zone that is driven through the ABA–2. For
dual-channel systems, test both audio signals separately.
Setting the DIP Switches
Finally, set the DIP Switches on the ABA-2 for the desired mode of operation.
The 8-selection DIP Switch (SW3) is used to set user selectable
options.
Notes:
- Either a slow whoop or a steady tone must be selected for each channel for a backup tone to be generated.
- Selecting both slow whoop and steady tone on the same channel will result in a combination of the two signals as a backup tone.
Document 15026 Rev. 1 3/8/93 P/N 15026:1 Page 4
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References
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